The 5SY4504-8 is an ac circuit breaker manufactured by Siemens and designed for use on 230/400VAC systems. It has a current rating of 4A, a 1+N pole configuration, and comes with DIN mounting for easy, secure installation. Its characteristics are described as D, featuring improved performance in contact protection, creepage and insulation distances, and temperature classifications. It is ideal for use in a wide range of industrial applications, such as motor control panels, distribution panels, lighting panels, and other general circuit protection applications.